HomeCasa Bulk image alt text that is accessible and useful for SEO
Generate alt text for many images at once: classify which are informative or decorative, write accessible descriptions and suggest file names, in a table ready to import. Designed for ChatGPT, Claude, Gemini and Microsoft Copilot. It includes 4 customizable variables and you can copy it for free in one click.
Beginner · Text · Pending editorial review
Prompt
Act as a web accessibility (WCAG) and image SEO specialist who writes alt text that is useful first for screen reader users and then for search engines.
Context:
- Page or section where the images appear: {{page}}
- Images (attached, or described with file name and what they show): {{images}}
- Content type: {{content_type}}
- Brand or products shown (correct names): {{brand}}
Deliverables:
1. Classify each image: informative, functional (link or button), complex (chart, infographic) or decorative. Decorative images get empty alt (alt=""), with a short explanation.
2. Alt text for every non-decorative image: describe what matters in the context of this page, usually under 125 characters, without starting with "image of" or "photo of".
3. For functional images, alt text that describes the action or destination, not the appearance.
4. For charts or infographics, a short alt plus a proposed long description for the page text.
5. A suggested file name: lowercase, hyphenated and descriptive.
6. An optional caption when it adds information not already in the text.
Constraints:
- Describe only what is visible or what I tell you. If you cannot see the image or a detail is missing (exact color, model, person), write [FILL IN] instead of guessing.
- Do not stuff keywords or repeat the same phrase across images.
- Do not identify real people by name unless I provide it.
- If two images are practically identical, say so and propose differentiated alt text or dropping one.
Format: a table with columns current file | type | alt | suggested file name | caption, ready to paste into a spreadsheet or export as CSV.How to use it
Attach the images if your assistant accepts images, or paste a list with each file name and a short description. Say which page they appear on, because the same alt text does not work in every context. Copy the table into your CMS or an import CSV.
Usage example
Page: hiking backpack product page · Images: pack-1.jpg (front view), pack-2.jpg (side pocket with bottle), mountains-banner.jpg (decorative background).
Sample output
Classification and alt text
| Current file | Type | Alt | Suggested file name | Caption |
|---|---|---|---|---|
| IMG_2041.jpg | Informative | Summit Gear Trailhead 30 hiking backpack in green, front view | summit-gear-trailhead-30-green-front.jpg | — |
| IMG_2042.jpg | Informative | Stretch side pocket on the Trailhead 30 holding a water bottle | trailhead-30-side-pocket-water-bottle.jpg | Side pocket fits bottles up to [FILL IN: max size] |
| IMG_2043.jpg | Informative | Hiker on a mountain trail wearing the Trailhead 30 backpack | trailhead-30-on-the-trail.jpg | — |
| mountains-bg.jpg | Decorative | alt="" | mountains-banner-background.jpg | — |
Notes
- mountains-bg.jpg only sets the mood of the banner and carries no information, so it gets
alt=""and screen readers skip it. - The person in IMG_2043 is not identified; if they are a named brand ambassador, tell me and I will add it: [FILL IN].
- I cannot confirm the exact shade of green: if the product has an official color name, swap it into the alt text and file name: [FILL IN: color name]…
Key facts
- Category
- Marketing & SEO · Technical SEO
- Output type
- Text
- Level
- Beginner
- Designed for
- ChatGPT, Claude, Gemini and Microsoft Copilot
- Verified in
- Pending editorial verification
- Variables
- Page or section, Images, Content type and Brand or products
- Language
- English
- Price
- Free, no sign-up
- Updated
- Nov 7, 2026
Frequently asked questions
When should alt text be left empty?
When the image is purely decorative and adds no information, such as a background or divider. Empty alt (alt="") tells screen readers to skip it.
Does alt text help SEO?
Yes: it helps search engines understand the image and how it relates to the page, and it matters for image search. But its main job is accessibility.
What is this prompt for?
Generate alt text for many images at once: classify which are informative or decorative, write accessible descriptions and suggest file names, in a table ready to import.
Which AI tools does it work with?
It is designed for ChatGPT, Claude, Gemini and Microsoft Copilot. We have not verified it in these tools yet, so results may vary between them.
How do I customize the prompt?
Click “Customize” and fill in the variables (Page or section, Images, Content type and Brand or products). The text updates instantly and you can then copy it in one click. Values are stored only in your browser.
Do I need experience to use it?
No. It is a beginner-level prompt: just fill in the details and paste it into your AI tool.
Is this prompt free?
Yes. Every HomeCasa Prompts prompt is free, with no sign-up or subscription. You can also use them in professional projects.
Can I trust the AI output?
Treat it as a high-quality draft: always check data, figures and important claims before publishing or making decisions.